package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * ClassName: DishServiceImpl
 * Package: com.itheima.reggie.service.impl
 * Description:
 *
 * @Author www.youkewang.top
 * @Create 2023-10-26 16:06
 * @Version 1.0
 */
@Service
@Slf4j
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {
    @Autowired
    private DishFlavorService dishFlavorService;

    @Override
    // 新增菜品，同时保存对应的口味数据
    @Transactional  // 由于涉及到多张表操作，需要开启事务
    public void saveWithFlavor(DishDto dishDto) {
        // 保存菜品的基本信息到菜品表中
        this.save(dishDto);

        Long dishId = dishDto.getId(); // 获取菜品ID

        List<DishFlavor> flavors = dishDto.getFlavors();  // 菜品口味集合

        // 处理菜品口味缺失菜品ID问题
        flavors = flavors.stream().map(item -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        // 保存菜品口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);
    }

    @Override
    public DishDto getByIdWithFlavor(Long id) {
        // 查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish, dishDto);

        // 查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(DishFlavor::getDishId, dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);

        dishDto.setFlavors(flavors);

        return dishDto;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        // 更新dish表基本信息
        this.updateById(dishDto);

        // 清理当前菜品对应口味数据 dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dishDto.getId());

        dishFlavorService.remove(queryWrapper);

        // 添加当前提交过来的口味数据 dish_flavor表的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();

        // 给flavors中的每一项对象添加dish_id
        flavors = flavors.stream().map(item -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }
}
